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From: R. Miriam bat Yosef
Subject: Implementation requirements
Date: 14 Shevat 5785
Recognition of specification-defined codes is parsing, not interpretation
The distinction holds for version 1.0.
What happens when version 2.0 adds codes?
A parser built for 1.0 cannot recognize 2.0 codes. It will return them as unknown. An application that relies on Level 3 annotation will miss them.
The specification says unknown codes should be accepted. But if applications expect semantic annotation, unknown codes become invisible.
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